CN109742436A

CN109742436A - A kind of battery core, power battery, power battery pack, power device and manufacturing method

Info

Publication number: CN109742436A
Application number: CN201811469201.0A
Authority: CN
Inventors: 周伟; 于哲勋; 刘辰光; 李阳兴; 王平华
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-12-03
Filing date: 2018-12-03
Publication date: 2019-05-10
Anticipated expiration: 2038-12-03
Also published as: CN109742436B

Abstract

The embodiment of the present application discloses a kind of battery core, it include: the first polarity piece, the second polarity piece and diaphragm, wherein, diaphragm is provided between first polarity piece and the second polarity piece, the polarity of first polarity piece and the second polarity piece is different, first polarity piece includes the first collector, and the spacing of the first collector and battery housing base is less than the spacing of diaphragm and battery housing base.A kind of power battery, power battery pack, power device and manufacturing method are additionally provided in the embodiment of the present application.The spacing of first collector and battery housing base in battery core by being set smaller than the spacing of diaphragm and battery housing base by the embodiment of the present application, a part of heat that battery core is generated is transmitted to battery case by collector, since the thermal coefficient of collector is far longer than diaphragm, therefore a part of heat that power battery interior battery core generates can be rapidly transferred to battery case by collector, and the heat that power battery interior battery core is generated is rapidly transferred to outside batteries.

Description

A kind of battery core, power battery, power battery pack, power device and manufacturing method

Technical field

This application involves power battery field more particularly to a kind of battery core, power battery, power battery pack, power devices And manufacturing method.

Background technique

Currently, power battery due to the advantages that its energy density is big, charging rate is fast, be widely applied electric car, In the scenes such as electric train or electric bicycle.During the quick charge of power battery, especially high-energy density is dynamic For power battery in quick charge, the battery core of power battery interior can generate a large amount of heat, if these heat cannot timely conduct To outside batteries, then the temperature of battery can be made quickly to increase, there is the risk of thermal runaway.

In order to solve the problems, such as thermal runaway involved in quick charge, usually using the method for strengthening heat dissipation, such as in battery Arrange that perhaps the heat of battery case by liquid cooling or direct-cooled system is transmitted to outside to liquid cooling by direct-cooled system outside shell.

But there is very big thermal resistance in the heat-transfer path of the battery core of inside battery to battery case, cause power battery interior electric The heat that core generates cannot be rapidly transferred to outside batteries.

Summary of the invention

This application provides a kind of battery core, power battery, power battery pack, power device and manufacturing methods, will be in battery core The spacing of first collector and battery housing base is set smaller than the spacing of diaphragm and battery housing base, so that battery core generates A part of heat battery case can be transmitted to by collector, since the thermal coefficient of collector is far longer than diaphragm, A part of heat that power battery interior battery core generates can be rapidly transferred to battery case by collector, so that power battery The heat that internal battery core generates can be rapidly transferred to outside batteries.

In a first aspect, it includes the first polarity piece, the second polarity piece and diaphragm that the embodiment of the present application, which provides a kind of battery core, Wherein, be provided with the diaphragm between the first polarity piece and the second polarity piece, wherein the first polarity piece be positive polarity piece, Second polarity piece is negative polarity piece or the first polarity piece is negative polarity piece, the second polarity piece is positive polarity piece, anode Property piece include two sides be coated with positive active material plus plate current-collecting body, negative polarity piece include two sides be coated with negative electrode active material Negative current collector, the first polarity piece is different with the polarity of the second polarity piece, the first polarity piece include the first collector, The spacing of first collector and battery housing base is less than the spacing of the diaphragm and battery housing base, wherein the first afflux The spacing of body and battery housing base can be the spacing of edge side and battery housing base after the first afflux body extension, first The spacing of collector and battery housing base be less than diaphragm and battery housing base spacing, be equivalent to using the first collector as " thermally conductive bridge " between battery core and battery case, (positive active material and cathode are living for the active material inside laminated cell Property object) when generating a large amount of heat under quickly charging battery or the scene of electricity consumption, to the thermally conductive road of battery case inside battery core Diameter has become active material, the first collector and electricity from the thermally conductive pathways of the active material of script, diaphragm and battery case The thermally conductive pathways of pond shell, since the heat transfer coefficient of the ratio of heat transfer coefficient diaphragm of collector is much larger, at this point, due to collector Thermal coefficient is far longer than diaphragm, therefore a part of heat that power battery interior battery core generates can rapidly be passed by collector It is delivered to battery case, the heat that power battery interior battery core is generated is rapidly transferred to outside batteries.

In the embodiment of the present application, provide a kind of battery core, the battery core include the first polarity piece, the second polarity piece and every Film, wherein diaphragm, the polarity phase of the first polarity piece and the second polarity piece are provided between the first polarity piece and the second polarity piece Different, the first polarity piece includes the first collector, and the spacing of the first collector and battery housing base is less than diaphragm and battery case The spacing of bottom.Using above-mentioned battery core, the spacing of the first collector and battery housing base in battery core is set smaller than diaphragm With the spacing of battery housing base, a part of heat that battery core is generated is transmitted to battery case by collector, due to The thermal coefficient of collector is far longer than diaphragm, therefore a part of heat that power battery interior battery core generates can pass through collector It is rapidly transferred to battery case, the heat that power battery interior battery core is generated is rapidly transferred to outside batteries.

In one possible implementation, which includes that the first extension interconnected and second prolong Extending portion, first extension are coated with the first active material, and second extension is from the first active material internal stretch and surpasses The spacing of the diaphragm out, second extension and battery housing base is less than the spacing of the diaphragm and the battery housing base, phase When in the first collector on the second extension uncoated first active material so that the active material on the first collector will not The second adjacent collector is touched because of being squeezed, and increases safety when battery core work.

Again, in the embodiment of the present application, the first active material is not coated on the second extension of the first collector, so that Active material on first collector will not touch the second adjacent collector because of being squeezed, and increase battery core work When safety.

In one possible implementation, insulating coating is coated on second extension.Insulating coating can be pottery Porcelain coating, ceramics can be the mixing for the compound or compound that the elements such as oxygen, carbon, nitrogen, boron, magnesium, aluminium, silicon and zinc are formed Object.The present embodiment coats insulating coating on the second extension, has completely cut off the active matter on the first collector by insulating coating Matter and the second adjacent collector so that the active material on the first collector will not be touched because of being squeezed it is adjacent Second collector further increases safety when battery core work.

In one possible implementation, which contacts with the battery housing base.In a kind of scene, In a kind of scene, the first collector is contacted with the inner surface of the battery case, in another scene, battery case and battery core Between be provided with backing board or insulation board, in this scene, backing board or insulation in the first polarity piece and battery housing base The appearance face contact of plate, in the present embodiment by extending the first collector and making between the first collector and battery housing base On the basis of being less than the spacing of diaphragm and battery housing base, the first polarity piece is contacted with battery housing base, further Increase inside battery core the heat of power battery interior battery core generation is obtained to the thermal coefficient of the heat-transfer path of battery case can be with It is transmitted to outside batteries more quickly.

In one possible implementation, one end of first collector is bending structure, the bending of the bending structure Place is contacted with the battery housing base.Wherein one end of the first collector can be L-type structure, the bending part of L-type structure it is outer Surface is the contact surface of the first collector and battery housing base, and one end of the first polarity piece also can be, but not limited to be inverted Y-shaped Structure, the outer surface for the opening portion that inverted Y-shaped Liang Ge branch is formed are the contact surface of the first collector and battery housing base, this reality The one end for applying the first polarity piece in example is bending structure, and the bending place of bending structure contacts with battery housing base, increases the The contact surface of one collector and battery housing base has better heat transfer property.

In one possible implementation, the end of first collector be embedded into the battery housing base or this The end of one collector is bonded in the battery housing base or the end of first collector is welded on the battery housing base. In the design that the end of the first polarity piece is embedded into battery housing base, can on battery case inner surface pregroove, By the way that the extension side of the first collector to be inserted directly into inside corresponding pregroove in battery core installation process, to realize the Contact of one collector with battery case.It, can be pre- in the design that the end of the first polarity piece is bonded in battery housing base First in the extension side surface coated with adhesive of the first collector, or in battery housing base inner surface coated with adhesive, in battery core Applying certain pressure in installation process keeps the extension side of the first collector Nian Jie with battery housing base realization, to realize first Contact of the collector with battery case, in the design that the end of the first polarity piece is welded on battery housing base, by the first collection The extension side of fluid is welded on battery housing base inner surface, to realize contact of first collector with battery case.

Secondly, in the embodiment of the present application, the end of the first polarity piece is embedded into battery housing base or the first polarity piece End is bonded in battery housing base or the end of the first polarity piece is welded on battery housing base, and the first collector can lead to It crosses various ways to contact with battery housing base, increases the flexibility and alternative of scheme.

In one possible implementation, which includes the first diaphragm and the second diaphragm, first diaphragm and this Second collector is provided between two diaphragms, the end of first diaphragm and second diaphragm engages.It will be with negative pole currect collecting The engagement of the end of the first adjacent diaphragm of body and the first diaphragm, by the obstruction of diaphragm so that negative current collector completely with it is extended Plus plate current-collecting body is isolated, and further improves the safety in battery core installation process.

In one possible implementation, which is positive polarity piece, which is negative polarity piece, Or, the first polarity piece is negative polarity piece, which is positive polarity piece.

Second aspect, the embodiment of the present application provide a kind of power battery, including battery case and above-mentioned first aspect mention The battery core of confession, wherein battery case is internally provided with battery core, and physical support of the battery case as battery core can be played battery core The effect being isolated from the outside world, battery case can have shape corresponding with the shape of battery core, while need not also make battery case The shape and size of the shape and size exact matching battery core of body.

The third aspect, the embodiment of the present application provide a kind of power battery pack, including at least two above-mentioned second aspects mention The power battery of confession.

Fourth aspect, the embodiment of the present application provide a kind of power device, including at least one above-mentioned second aspect provides Power battery.

5th aspect, the embodiment of the present application provide the production method of power battery, and production method specifically includes: by first Polarity piece, diaphragm and the second polarity piece stack gradually placement, to form battery core, wherein the one of at least one the first polarity piece Side exceeds the diaphragm, which includes the first collector；The battery core is loaded to the battery case along target direction, So that the spacing of at least one first collector and the battery housing base is less than the diaphragm and the battery housing base Spacing, the target direction are the direction that the first polarity on piece exceeds the diaphragm side.

In the embodiment of the present application, a kind of production method of power battery is provided, by the first polarity piece, diaphragm and the second pole Property piece stack gradually placement, to form battery core, wherein the side of at least one the first polarity piece exceed diaphragm, the first polarity piece Including the first collector, battery core is loaded to battery case along target direction, so that at least one first collector and electricity The spacing of pond housing bottom is less than the spacing of diaphragm and battery housing base, and target direction is that the first polarity on piece exceeds diaphragm one The direction of side.The power battery made by the above method, the spacing of the first collector and battery housing base in battery core It is set smaller than the spacing of diaphragm and battery housing base, a part of heat that battery core is generated is transmitted to by collector Battery case, since the thermal coefficient of collector is far longer than diaphragm, a part of heat that power battery interior battery core generates It can be rapidly transferred to battery case by collector, the heat that power battery interior battery core is generated rapidly is transmitted To outside batteries.

In one possible implementation, the first polarity piece, diaphragm and the second polarity piece are stacked gradually placement by this, packet It includes: the first polarity piece, diaphragm and the second polarity piece is successively placed with Flat stacked.

In one possible implementation, the first polarity piece, diaphragm and the second polarity piece are stacked gradually placement by this, with Form battery core, wherein the side of at least one the first polarity piece exceeds the diaphragm, comprising: by the first polarity piece, diaphragm and the Two polarity pieces, which stack gradually, to be placed and is wound, to form battery core, wherein at least one the first polarity piece and coiling direction Vertical side exceeds the diaphragm.

In one possible implementation, the first polarity piece, diaphragm and the second polarity piece are stacked gradually placement by this, with Form battery core, wherein the side of at least one the first polarity piece exceeds the diaphragm, comprising: the first polarity piece is punched to list Sheet the first polarity piece；Second polarity piece is stacked gradually with diaphragm and places and is wound, by single sheet the first polarity piece Adjacent windings interlayer after being arranged in winding forms battery core in, wherein at least one single sheet the first polarity piece and winding The vertical side in direction exceeds the diaphragm；Or, the second polarity piece is punched to single sheet the second polarity piece；By the first polarity piece with Diaphragm stack gradually place and be wound, by single sheet the second polarity piece be arranged in winding after adjacent windings interlayer every In, form battery core, wherein at least one the first polarity piece side vertical with coiling direction exceeds the diaphragm；Or, by first Polarity piece is punched to single sheet the first polarity piece；Second polarity piece is punched to single sheet the second polarity piece；Diaphragm is carried out more Single sheet the first polarity piece and single sheet the second polarity piece are arranged alternately neighboring separators interval after folding by secondary folding In, form battery core, wherein at least one single sheet the first polarity piece side vertical with folding direction exceeds the diaphragm.

In one possible implementation, this loads the battery core to the battery case along target direction, so that The spacing of at least one first collector and the battery housing base is less than the spacing of the diaphragm and the battery housing base, packet It includes: loading the battery core to the battery case along the target direction, so that at least one first collector and the battery Housing bottom contact.In the present embodiment, battery core is loaded to battery case along target direction, so that at least one first collection Fluid is contacted with battery housing base, by extending the first collector and making between the first collector and battery housing base On the basis of being less than the spacing of diaphragm and battery housing base, the first polarity piece is contacted with battery housing base, further Increase inside battery core the heat of power battery interior battery core generation is obtained to the thermal coefficient of the heat-transfer path of battery case can be with It is transmitted to outside batteries more quickly.

In one possible implementation, this loads the battery core to the battery case along target direction, so that At least one first collector is contacted with the battery housing base, comprising: loads the battery core to the battery along target direction In shell, so that at least one first collector is embedded into the battery housing base；Or, the battery core is filled out along target direction It is filled in the battery case, so that at least one first collector is bonded in the battery housing base；Or, along target direction The battery core is loaded to the battery case, so that at least one first collector is welded on the battery housing base.

As can be seen from the above technical solutions, the application has the following advantages:

In the embodiment of the present application, a kind of battery core, including the first polarity piece, the second polarity piece and diaphragm are provided, wherein It is provided with diaphragm between first polarity piece and the second polarity piece, the polarity of the first polarity piece and the second polarity piece is different, the first pole Property piece include the first collector, the spacing of the first collector and battery housing base is less than between diaphragm and battery housing base Away from.Using above-mentioned battery core, the spacing of the first collector and battery housing base in battery core is set smaller than diaphragm and battery case The spacing of body bottom, a part of heat that battery core is generated is transmitted to battery case by collector, due to collector Thermal coefficient is far longer than diaphragm, therefore a part of heat that power battery interior battery core generates can rapidly be passed by collector It is delivered to battery case, the heat that power battery interior battery core is generated is rapidly transferred to outside batteries.

Detailed description of the invention

Fig. 1 is a kind of stereoscopic schematic diagram of laminated cell in the embodiment of the present application；

Fig. 2 is an a kind of side view of laminated cell in the embodiment of the present application；

Fig. 3 is an a kind of top view of laminated cell in the embodiment of the present application；

Fig. 4 is a kind of another top view of laminated cell in the embodiment of the present application；

Fig. 5 is a kind of another top view of laminated cell in the embodiment of the present application；

Fig. 6 is a kind of another top view of laminated cell in the embodiment of the present application；

Fig. 7 is a kind of another side view of laminated cell in the embodiment of the present application；

Fig. 8 is an a kind of partial side view for winding battery core in the embodiment of the present application；

Fig. 9 is an a kind of top view for winding battery core in the embodiment of the present application；

Figure 10 is an a kind of side view of lamination winding battery core in the embodiment of the present application；

Figure 11 is a kind of another side view of lamination winding battery core in the embodiment of the present application；

Figure 12 is an a kind of top view of lamination winding battery core in the embodiment of the present application；

Figure 13 is a kind of another side view of lamination winding battery core in the embodiment of the present application；

Figure 14 is a kind of another side view of laminated cell in the embodiment of the present application；

Figure 15 is the structural schematic diagram of the first polarity piece of laminated cell in the present embodiment；

Figure 16 is the structural schematic diagram that the first polarity piece of battery core is wound in the present embodiment；

Figure 17 is a kind of another side view of laminated cell in the embodiment of the present application；

Figure 18 is a kind of another side view of laminated cell in the embodiment of the present application；

Figure 19 is a kind of another side view of laminated cell in the embodiment of the present application；

Figure 20 is a kind of another side view of laminated cell in the embodiment of the present application；

Figure 21 a is a kind of another side view of laminated cell in the embodiment of the present application；

Figure 21 b is a kind of another side view of laminated cell in the embodiment of the present application；

Figure 22 is a kind of another side view of laminated cell in the embodiment of the present application；

Figure 23 is one embodiment schematic diagram of the production method of power battery in the embodiment of the present application.

Specific embodiment

The embodiment of the present application provides a kind of battery core, power battery, power battery pack, power device and manufacturing method, will The spacing of the first collector and battery housing base is set smaller than the spacing of diaphragm and battery housing base in battery core, so that electric A part of heat that core generates can be transmitted to battery case by collector, since the thermal resistance of collector is far smaller than diaphragm, because A part of heat that this power battery interior battery core generates can be rapidly transferred to battery case by collector, so that power electric The heat that battery core generates inside pond can be rapidly transferred to outside batteries.

The description and claims of this application and term " first ", " second ", " third " " in above-mentioned attached drawing The (if present)s such as four " are to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should manage The data that solution uses in this way are interchangeable under appropriate circumstances, so that the embodiments described herein can be in addition to illustrating herein Or the sequence other than the content of description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that Cover it is non-exclusive include, for example, containing the process, method, system, product or equipment of a series of steps or units need not limit In step or unit those of is clearly listed, but may include be not clearly listed or for these process, methods, produce The other step or units of product or equipment inherently.

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, those skilled in the art's every other implementation obtained without creative efforts Example, shall fall within the protection scope of the present invention.

Power battery includes battery core and the shell for accommodating battery core, and power battery is especially high during quick charge When the power battery quick charge of energy density, the active material inside battery core can generate a large amount of heat, if these heat are not It can be timely transmitted to battery case, then the temperature of battery core can be made quickly to increase, making power battery, there are thermal runaway risks, seriously Influence the safety of battery.Battery core includes positive polarity piece, negative polarity piece and diaphragm 30, it is generally the case that the edge side of diaphragm 30 Can edge side and negative polarity piece beyond adjacent positive piece edge side, the edge side of diaphragm 30 and cell housing inside surface Apart from the edge side less than positive polarity piece and negative polarity piece at a distance from cell housing inside surface, therefore, to electricity inside battery core The heat-transfer path of 60 inner surface of pond shell is active material, diaphragm 30 and battery case 60, due to the thermal coefficient of diaphragm 30 Very little, results in that heat transfer efficiency is very low, and the heat that active material generates inside battery core cannot be transmitted to battery case 60 quickly, makes electricity The temperature of core quickly increases, and making power battery, there are thermal runaway risks.

This to solve the problems, such as, the embodiment of the present invention proposes a kind of battery core, by the plus plate current-collecting body 10 or cathode collection of battery core Fluid 20 extends, so that the spacing of plus plate current-collecting body 10 or negative current collector 20 and 60 bottom of battery case is less than diaphragm 30 and electricity The spacing of 60 bottom of pond shell below will describe to a kind of one embodiment of battery core provided by the present application in detail.

It is understood that the battery core manufacture craft of power battery can include but is not limited to lamination process, winding process And the technique that lamination and winding combine.Below will to a kind of battery core made of lamination process provided by the present application (with Down be known as laminated cell) one embodiment describe in detail.

Referring to Fig. 1, Fig. 1 is a kind of stereoscopic schematic diagram of laminated cell in the embodiment of the present application, specifically, Fig. 1 is shown Laminated cell include interactive stacking the first polarity piece and the second polarity piece, wherein the first polarity piece be positive polarity piece, second Polarity piece is negative polarity piece, or, the first polarity piece is negative polarity piece, the second polarity piece is positive polarity piece, positive polarity piece and cathode Property piece between be provided with diaphragm 30, septation 30 prevents anode for separating the positive polarity piece of battery and negative polarity piece The direct contact of property piece and negative polarity piece.Positive polarity piece includes the plus plate current-collecting body 10 that two sides is coated with positive active material 40, Negative polarity piece includes the negative current collector 20 that two sides is coated with negative electrode active material 50, changes a kind of form of presentation, positive electrode active material Matter 40 and plus plate current-collecting body 10 constitute positive polarity piece, and negative electrode active material 50 and negative current collector 20 constitute positive polarity piece.

It is a kind of side view of laminated cell in the embodiment of the present application referring to Fig. 2 and Fig. 3, Fig. 2, Fig. 3 is the application implementation A kind of top view of laminated cell in example, as shown in figure 2, the present embodiment is by the plus plate current-collecting body 10 of laminated cell or bears Pole collector 20 extends, so that the spacing of plus plate current-collecting body 10 and 60 bottom of battery case is less than diaphragm 30 and 60 bottom of battery case The spacing of the spacing in portion or the negative current collector 20 of laminated cell and 60 bottom of battery case is less than diaphragm 30 and battery case 60 The spacing of bottom.It is small to plus plate current-collecting body 10 and the spacing of 60 bottom of battery case below for extending plus plate current-collecting body 10 It is described in detail in the case where diaphragm 30 and the spacing of 60 bottom of battery case.

In the present embodiment, under the scene that plus plate current-collecting body 10 and diaphragm 30 are all rectangular sheet, as illustrated by figure 3, Plus plate current-collecting body 10 includes four edge sides (plus plate current-collecting body top side A1, plus plate current-collecting body bottom side B1, plus plate current-collecting body left side C1 With D1 on the right side of plus plate current-collecting body), it should be noted that " plus plate current-collecting body top side A1 ", " plus plate current-collecting body bottom side B1 ", " anode The direction that C1 " and " D1 on the right side of plus plate current-collecting body " are merely representative of between four edge sides of plus plate current-collecting body on the left of collector is different, The absolute limit to 10 edge direction of plus plate current-collecting body is not constituted.Wherein, term " direction " can be understood as plus plate current-collecting body The end face direction of an edge side on 10.For example, plus plate current-collecting body top side A1 can be any one side of plus plate current-collecting body 10 Edge side, then plus plate current-collecting body bottom side B1 is with the plus plate current-collecting body top side side A1 towards opposite side, and plus plate current-collecting body left side C1 can To be any side other than the plus plate current-collecting body top side side A1 and the plus plate current-collecting body bottom side side B1, D1 on the right side of plus plate current-collecting body For with the side C1 on the left of plus plate current-collecting body towards opposite side.In the present embodiment, plus plate current-collecting body 10 be can be anode collection The wherein side of D1 is prolonged completely on the right side of body top side A1, plus plate current-collecting body bottom side B1, plus plate current-collecting body left side C1 or plus plate current-collecting body Long, an edge side of the plus plate current-collecting body 10 after extension exceeds adjacent diaphragm 30.

In the present embodiment, under the scene that plus plate current-collecting body 10 and diaphragm 30 are all rectangular sheet, as shown in figure 3, diaphragm 30 It also include four edge sides (diaphragm top side A2, diaphragm bottom side B2, on the left of diaphragm on the right side of C2 and diaphragm D2), diaphragm top side A2 can be with It is with plus plate current-collecting body top side A1 on diaphragm 30 towards consistent edge side, diaphragm bottom side B2, which can be, to be collected on diaphragm 30 with anode Towards consistent edge side, diaphragm left side C2 can be on diaphragm 30 with C1 on the left of plus plate current-collecting body towards unanimously fluid bottom side B1 Edge side, diaphragm top side A2 can be on diaphragm 30 with plus plate current-collecting body top side A1 towards consistent edge side.It needs to illustrate , diaphragm top side A2 is also possible on diaphragm 30 and plus plate current-collecting body bottom side B1, plus plate current-collecting body left side C1 or anode collection D1 is defined above just for the sake of facilitating description towards consistent edge side on the right side of body, does not constitute to each edge of diaphragm 30 The absolute limit of side direction.

As illustrated in FIG. 2, the spacing of plus plate current-collecting body 10 and 60 bottom of battery case is less than diaphragm 30 and battery case The spacing of 60 bottoms, after wherein the spacing of plus plate current-collecting body 10 and 60 bottom of battery case can extend for plus plate current-collecting body 10 Edge side after extension is hereafter known as extending side by the spacing of edge side and 60 bottom of battery case for convenience of describing.Extend side It can be in plus plate current-collecting body top side A1, plus plate current-collecting body bottom side B1, plus plate current-collecting body left side C1 and plus plate current-collecting body right side D1 Any side.It should be noted that 60 bottom of battery case can for extend side towards in opposite battery case 60 Surface, for example, plus plate current-collecting body 10 and the spacing of 60 bottom of battery case are specially when extending plus plate current-collecting body bottom side B1 Plus plate current-collecting body 10 extends the spacing of side and battery case 60 inner surface opposite with the extension side of plus plate current-collecting body 10.In another example When extending at the top of by plus plate current-collecting body 10,60 bottom of battery case is interpreted as extending side at the top of plus plate current-collecting body 10 at this time Opposite 60 inner surface of battery case.It should be noted that term " spacing " can for extensions side end face and target face it Between vertical range or minimum range, specifically, the spacing of plus plate current-collecting body 10 and 60 bottom of battery case can be anode collection The spacing for extending the target face where side end face and 60 bottom of battery case of fluid 10.

In the present embodiment, referring to Fig. 3, under the scene that plus plate current-collecting body 10 and diaphragm 30 are all rectangular sheet, anode collection Extension side on body 10 may be considered straight line from the point of view of the depression angle in Fig. 3 or be similar to straight line, plus plate current-collecting body 10 can extend the straight line and 60 bottom institute of battery case where side with the spacing of 60 bottom of battery case for plus plate current-collecting body 10 Target face spacing.Straight line where plus plate current-collecting body 10 extends side is put down with the target face where 60 bottom of battery case It goes, between the target face where 60 bottom of each point and battery case on straight line where the side of the extension of plus plate current-collecting body 10 at this time Away from identical, then plus plate current-collecting body 10 extends all the points on the straight line where side and the target face where 60 bottom of battery case Spacing is both less than the spacing of neighboring separators 30 Yu 60 bottom of battery case.

It is a kind of top view of laminated cell in the embodiment of the present application referring to Fig. 4, Fig. 4, it is as shown in Figure 4 such, another In a kind of scene, although plus plate current-collecting body 10 will plus plate current-collecting body top side A1, plus plate current-collecting body bottom side B1, on the left of plus plate current-collecting body The wherein side of C1 or plus plate current-collecting body right side D1 extend, but from above-mentioned plus plate current-collecting body 10 unlike rectangular sheet, anode Collector 10 extends side can be a curve from the point of view of the depression angle in Fig. 4, and plus plate current-collecting body 10 extends curve where side It is not parallel with the target face where 60 bottom of battery case, be equivalent to extend after plus plate current-collecting body 10 include be no more than it is adjacent every First extension 101 of film 30 and the second extension 102 that neighboring separators 30 are connect and exceeded with the first extension 101, In the first extension 101 be rectangular sheet, the second extension 102 not be rectangular sheet.Plus plate current-collecting body 10 extends song where side at this time Each point on line is not fully identical as the spacing of the target face where 60 bottom of battery case, at this point, only needing anode collection Body 10, which extends on straight line or curve where side, has a section, the target face where point and 60 bottom of battery case on this section Spacing be less than neighboring separators 30 and 60 bottom of battery case spacing.It should be noted that in another scene, this implementation The shape of the second extension 102 in example is not limited to illustrated by Fig. 4, is one in the embodiment of the present application referring to Fig. 5, Fig. 5 The top view of kind laminated cell, as shown in Figure 5, the extension side of the second extension 102 of plus plate current-collecting body 10 does not need whole Beyond adjacent diaphragm 30, it is also possible to a part of 102 edge side of the second extension beyond adjacent diaphragm 30, changes one kind and retouch Mode is stated, need to only guarantee that there are a straightway or curved sections on the straight line or curve where plus plate current-collecting body 10 extends side, it should The spacing of the target face where point and 60 bottom of battery case on straightway or curved section is less than neighboring separators 30 and battery case The spacing of 60 bottom of body.

It is a kind of top view of laminated cell in the embodiment of the present application referring to Fig. 6, Fig. 6, it is as shown in Figure 6 such, another In a kind of scene, plus plate current-collecting body 10 can will plus plate current-collecting body top side A1, plus plate current-collecting body bottom side B1, on the left of plus plate current-collecting body At least two sides of C1 or plus plate current-collecting body right side D1 are extended, for example, can be by plus plate current-collecting body top side A1 and anode collection Body bottom side B1 is extended, or D1 on the right side of C1 on the left of plus plate current-collecting body and plus plate current-collecting body is extended, or by anode collection Body top side A1, plus plate current-collecting body bottom side B1 and plus plate current-collecting body left side C1 are extended.It is as shown in FIG. 6, with plus plate current-collecting body For D1 is extended on the right side of left side C1 and plus plate current-collecting body, D1 is on the right side of by C1 on the left of plus plate current-collecting body and plus plate current-collecting body When being extended, the extension side of C1 exceeds with C1 on the left of plus plate current-collecting body towards consistent 30 edge of diaphragm on the left of plus plate current-collecting body Side, so that the spacing for extending side and 60 bottom of battery case of C1 is less than neighboring separators 30 and battery case on the left of plus plate current-collecting body The spacing of 60 bottoms, 60 bottom of battery case is in the battery case 60 opposite with the extension side of C1 on the left of plus plate current-collecting body at this time Surface, while the extension side of D1 exceeds with D1 on the right side of plus plate current-collecting body towards consistent 30 edge of diaphragm on the right side of plus plate current-collecting body Side, so that the spacing for extending side and 60 bottom of battery case of D1 is less than neighboring separators 30 and battery case on the right side of plus plate current-collecting body The spacing of 60 bottoms, 60 bottom of battery case is in the battery case 60 opposite with the extension side of D1 on the right side of plus plate current-collecting body at this time Surface.

It should be pointed out that plus plate current-collecting body 10 can be by plus plate current-collecting body top side A1, plus plate current-collecting body bottom side B1, just At least two sides of C1 or plus plate current-collecting body right side D1 carry out in extended scene on the left of the collector of pole, and each shape for extending side is also It is referred to Fig. 4 and Fig. 5 and corresponding description, overlaps will not be repeated.

In the present embodiment, the extension side of plus plate current-collecting body 10 exceeds adjacent diaphragm 30, so that plus plate current-collecting body 10 and electricity The spacing of 60 bottom of pond shell is less than the spacing of diaphragm 30 and 60 bottom of battery case, is equivalent to plus plate current-collecting body 10 as electricity Thermally conductive bridge between core and battery case 60, (positive active material 40 and cathode are living for the active material inside laminated cell Property object) when generating a large amount of heat under quickly charging battery or the scene of electricity consumption, to the thermally conductive road of battery case inside battery core Diameter from the arrangement mode of the active material of script, diaphragm 30 and battery case, become active material, plus plate current-collecting body 10 with And the arrangement mode of battery case, as shown in table 1, table 1 is the heat transfer coefficient table of comparisons of diaphragm 30 and each material of collector, from Table 1 is it is found that the heat transfer coefficient of the ratio of heat transfer coefficient diaphragm 30 of collector is much larger, at this point, the thermal coefficient due to collector is remote Much larger than diaphragm 30, therefore a part of heat that power battery interior battery core generates can be rapidly transferred to battery by collector Shell 60, the heat that power battery interior battery core is generated are rapidly transferred to outside batteries.

Table 1

In the present embodiment, a laminated cell may include multiple plus plate current-collecting bodies 10, wherein extend and exceed it is adjacent every The plus plate current-collecting body 10 of film 30 can be whole plus plate current-collecting bodies 10 of laminated cell, in another kind design, extends and exceeds The plus plate current-collecting body 10 of neighboring separators 30 can be at least one plus plate current-collecting body 10 in whole plus plate current-collecting bodies 10, such as Fig. 7 Shown, Fig. 7 is a kind of side view of laminated cell in the embodiment of the present application, and Fig. 7, which is shown, to be extended and exceed neighboring separators 30 Plus plate current-collecting body 10 is only the situation of a part in whole plus plate current-collecting bodies 10.

In the present embodiment, based on the same inventive concept, negative current collector 20 and 60 bottom of battery case of laminated cell Spacing has phase less than concrete condition and Fig. 1 to the laminated cell shown in Fig. 7 of diaphragm 30 and the spacing of 60 bottom of battery case Like or identical characteristic, overlaps will not be repeated.

It should be pointed out that laminated cell structure shown in Fig. 1 is only a kind of signal, and in practical applications, positive grade collection Depending on the quantity of fluid, negative grade collector and diaphragm 30 can be according to actual demand, in addition, shown in Fig. 1, Fig. 2 and Fig. 7 The two sides of laminated cell are all diaphragm 30, and in practical applications, the structure of laminated cell side can be set to diaphragm 30, anode Any one in property piece and negative polarity piece.

It should be pointed out that although Fig. 1 is not shown into Fig. 7, actual laminated cell polarity piece and diaphragm 30 it Between can also be filled with electrolyte.

It should be pointed out that actual laminated cell can also include positive pole although Fig. 1 is not shown into Fig. 7 Ear and negative lug, wherein positive pole ear is drawn from anode pole piece, and each anode pole piece draws a positive pole ear, negative lug It is drawn from cathode pole piece, each cathode pole piece draws a negative lug, the lead direction of positive pole ear and drawing for negative lug For directional spreding in the vertical direction stacked with laminated cell, positive pole ear and negative lug can be distributed in laminated cell out The same side is not ipsilateral.

The above are a kind of introductions that one embodiment of the battery core made of lamination process carries out provided by the present application, connect Get off and one embodiment of manufactured battery core (hereinafter referred to as winding battery core) by winding process is described in detail.It please join Fig. 8 is read, Fig. 8 is an a kind of partial side view for winding battery core in the embodiment of the present application, it is to be understood that and pass through lamination Unlike battery core made of technique successively places polarity piece and diaphragm 30 with Flat stacked, firstly, what lamination process used Diaphragm 30, plus plate current-collecting body 10 and negative current collector 20 can be single sheet rectangular sheet, and diaphragm 30 that winding process uses, just Pole collector 10 and negative current collector 20 can be the rectangle lengthy motion picture for not being punched into single sheet rectangular sheet, in addition, passing through winding work Battery core made of skill is wound after the first polarity piece, diaphragm 30 are stacked gradually placement with the second polarity piece, therefore, first The position that can carry out extending and being more than neighboring separators 30 on collector can only be along the vertical direction wound.In the first afflux Body, diaphragm 30 and the second collector are under the scene of rectangular sheet, referring to Fig. 9, Fig. 9 is a kind of winding electricity in the embodiment of the present application The top view of core, as shown in Figure 9 such, on the first collector including two can carry out extending and more than neighboring separators 30 Edge side, the two edge sides are two edge sides opposite on rectangular sheet, such as edge side can be first on rectangular sheet On the left of collector top side and the first collector bottom side or the first collector and on the right side of the first collector.

The above are a kind of introductions that one embodiment of battery core manufactured by winding process carries out provided by the present application, and For the battery core (hereinafter referred to as lamination winding battery core) made of lamination and the technique that combines of winding, with the first polarity piece, Diaphragm 30 and the second polarity piece is for rectangular sheet, one kind of the battery core made of the technique combined lamination and winding are being set In meter, referring to Fig. 10, Figure 10 is a kind of side view of lamination winding battery core in the embodiment of the present application, it is folded as shown in Figure 10 Piece winds battery core, is to stack gradually diaphragm 30 and the first polarity piece to place and be wound, the second polarity piece is punched to list Sheet rectangular sheet, and single sheet rectangular sheet is arranged in the adjacent windings interlayer after winding in, it should be noted that it is not limited to Shown in Figure 10, diaphragm 30 and the second polarity piece can also be stacked gradually and place and be wound, the first polarity piece is rushed It is cut to single sheet rectangular sheet, and single sheet rectangular sheet is arranged in the adjacent windings interlayer after winding in.With pass through lamination work Unlike battery core made of skill, it can be prolonged lamination and the polarity on piece for winding battery core made of the technique combined The position for growing and be more than neighboring separators 30 can only be the edge side for the vertical direction that edge is wound.The first collector, diaphragm 30 with Second collector is under the scene of rectangular sheet, and the first collector can be single sheet rectangular sheet or rectangle lengthy motion picture, in the first afflux Body is how to extend the first collector under the scene of single sheet rectangular sheet and be referred to Fig. 1 to Fig. 7 and its corresponding description, weight Multiple place repeats no more, and in the case where the first collector is the scene of rectangle lengthy motion picture, how to extend the first collector and is referred to Fig. 8 extremely Fig. 9 and its corresponding description, overlaps will not be repeated.It may be noted that being, although positive polarity piece is not shown in Figure 10 and bears The active material of pole polarity on piece coating, but in practical applications, phase can be coated in positive polarity piece and negative polarity on piece The active material answered.

In another design of the battery core made of lamination and the technique that combines of winding, with the first polarity piece, every For rectangular sheet, to please refer to Figure 11, Figure 11 is a kind of lamination winding battery core in the embodiment of the present application for film 30 and the second polarity piece Side view diaphragm 30 is wound as shown in Figure 11, the first polarity piece and the second polarity piece are punched to single sheet Rectangular sheet, and single sheet polarity piece is arranged alternately in the interval of neighboring separators 30 after the coiling, it is to be understood that this implementation Example septation 30 surrounds the structure that the interval of neighboring separators 30 formed is a face closure, open on three sides.Work is wound with passing through Unlike battery core made of skill, in the scene that the first collector, diaphragm 30 and the second collector are rectangular sheet in the present embodiment Under, the first collector is single sheet rectangular sheet, and the position that can carry out extending and being more than neighboring separators 30 on the first collector is It is spaced three edge sides in the direction of open on three sides along neighboring separators 30, changes a kind of describing mode, the first collection in the present embodiment Other three edge sides on fluid other than being spaced the edge side in closing direction in neighboring separators 30 can extend and surpass Adjacent diaphragm 30 out.In the case where the first collector, diaphragm 30 and the second collector are the scene of rectangular sheet, Figure 12 is please referred to, is schemed 12 include on the first collector as shown in fig. 12 for the top view of lamination winding battery core a kind of in the embodiment of the present application Three edge sides that can carry out extending and being more than neighboring separators 30.

In another design of the battery core made of lamination and the technique that combines of winding, with the first polarity piece, every For rectangular sheet, to please refer to Figure 13, Figure 13 is a kind of lamination winding battery core in the embodiment of the present application for film 30 and the second polarity piece Side view diaphragm 30 is repeatedly folded as shown in Figure 13, the first polarity piece and the second polarity piece are punched to list Sheet rectangular sheet, and single sheet polarity piece is arranged alternately in the interval of neighboring separators 30 after folding.It is understood that this Embodiment septation 30 surrounds the structure that the interval of neighboring separators 30 formed is a face closure, open on three sides.It is rolled up with passing through It in the first collector, diaphragm 30 and the second collector is rectangular sheet in the present embodiment unlike battery core made of winding technologe Under scene, the first collector is single sheet rectangular sheet, and the position for extending and be more than neighboring separators 30 can be carried out on the first collector Setting is three edge sides that the direction of open on three sides is spaced along neighboring separators 30, changes a kind of describing mode, the in the present embodiment Other three edge sides on one collector other than being spaced the edge side in closing direction in neighboring separators 30 can extend And exceed adjacent diaphragm 30.In the case where the first collector, diaphragm 30 and the second collector are the scene of rectangular sheet, figure is please referred to 13, Figure 13 wind the top view of battery core for lamination a kind of in the embodiment of the present application, as shown in Figure 13, on the first collector The edge side that can carry out extending and being more than neighboring separators 30 including three.

It should be pointed out that diaphragm 30 and the first polarity lamella poststack can be carried out repeatedly again in another scene Fold, the second polarity piece be punched to single sheet rectangular sheet, and by single sheet polarity piece be arranged alternately after folding it is adjacent every It, at this time only can be with there are two edge side on the first collector unlike lamination winding battery core in the interval of film 30 and in Figure 13 Extend and exceeds neighboring separators 30.It should be pointed out that diaphragm 30 and the second polarity piece can be laminated in another scene It is repeatedly folded again afterwards, the first polarity piece is punched to single sheet rectangular sheet, and single sheet polarity piece is arranged alternately and is being rolled over In the interval of neighboring separators 30 of poststack, it can extend and exceed at this time the edge side and Figure 13 of neighboring separators 30 on the first collector Shown in the first polarity piece it is consistent, on the first collector include three can carry out extend and be more than neighboring separators 30 edges Side.

It should be pointed out that not limiting the positive polarity piece that battery core includes in the application, the material of negative polarity piece and diaphragm 30 Positive active material known in the art 40 (such as lithium mangnese oxide, lithium cobalt oxide, lithiated nickel dioxide, lithium phosphate can be used in material Iron, or compound or mixture containing at least one above-mentioned element) to aluminium, nickel, copper or contain at least one above-mentioned element The plus plate current-collecting body 10 that alloy is formed is coated, forms positive polarity piece.Further, it is possible to use negative electrode active known in the art Substance 50 (such as lithium metal, lithium alloy, carbon, petroleum coke, active carbon, graphite, silicon compound, tin compound, titanium compound, or Alloy containing at least one above-mentioned element) to copper, nickel, aluminium or the cathode collection of the alloy formation containing at least one above-mentioned element Fluid 20 is coated, forms negative polarity piece.In addition, diaphragm 30 can be multilayer film, which has fine pore structure, and And it is formed by polyethylene, polypropylene or combinations thereof, or can be for for solid polymer electrolyte or gel formula polymer electrolytic Matter, such as polyvinylidene fluoride, polyethylene oxide, polyacrylonitrile, polyvinyl fluoride-hexafluoropropylene copolymer polymer film.

Secondly, providing a kind of battery core, including the first polarity piece, the second polarity piece and diaphragm in the embodiment of the present application 30, wherein diaphragm 30, the polarity phase of the first polarity piece and the second polarity piece are provided between the first polarity piece and the second polarity piece Different, the first polarity piece includes the first collector, and the first collector and the spacing of 60 bottom of battery case are less than diaphragm 30 and battery The spacing of 60 bottom of shell.Using above-mentioned battery core, set the first collector in battery core and the spacing of 60 bottom of battery case to Less than the spacing of diaphragm 30 and 60 bottom of battery case, a part of heat that battery core is generated is transmitted to electricity by collector Pond shell 60, since the thermal coefficient of collector is far longer than diaphragm 30, a part that power battery interior battery core generates Heat can be rapidly transferred to battery case 60 by collector, and the heat that power battery interior battery core is generated is rapidly It is transmitted to outside batteries.

Optionally, on the basis of the embodiment that above-mentioned Fig. 1 to Figure 13 is described, the of battery core provided by the embodiments of the present application In one alternative embodiment, Figure 14 is please referred to, Figure 14 is a kind of side view of laminated cell in the embodiment of the present application, with laminated battery For core, the first collector includes the first extension 101 interconnected and the second extension 102；First extension 101 applies It is covered with the first active material, the second extension 102 is from the first active material internal stretch and exceeds diaphragm 30, the second extension 102 are less than the spacing of diaphragm 30 and 60 bottom of battery case with the spacing of 60 bottom of battery case.

In the present embodiment, the active material coating situation of the first collector is described, using the first collector as anode collection For body 10, in order to improve the heat-transfer path from battery core to battery case, the present embodiment is by plus plate current-collecting body 10 or negative pole currect collecting Body 20, which extends, simultaneously exceeds diaphragm 30, although only by one of afflux body extension of plus plate current-collecting body 10 and negative current collector 20, Such as: only extend plus plate current-collecting body 10 without extending negative current collector 20, at this point, the extension side of plus plate current-collecting body 10 is beyond adjacent Diaphragm 30, and the edge side of the diaphragm 30 exceeds the edge side of not extended negative current collector 20, and diaphragm 30 can hinder just Direct contact between pole collector 10 and negative current collector 20, if but extending and exceeding 10 surface of plus plate current-collecting body of diaphragm 30 Coated with positive active material 40, during packaging electric core, the active material on extended plus plate current-collecting body 10 is possible to Adjacent negative current collector 20 or negative electrode active material 50 are touched because of being squeezed, and then the safety for short circuit occur is asked Topic.Therefore, positive active material 40 is coated in the present embodiment not on the second extension 102 of plus plate current-collecting body 10, so that just Active material on pole collector 10 will not touch adjacent negative current collector 20 because of being squeezed, and increase battery core work Safety when making.It should be noted that if diaphragm 30 exceeds the first extension 101, at this point, the second extension 102 can wrap It includes without departing from the part of diaphragm 30 and the part beyond diaphragm 30, is equivalent to the plus plate current-collecting body 10 for more than exceeding diaphragm 30 Upper uncoated positive active material 40, the also uncoated positive active matter on a bit of plus plate current-collecting body 10 without departing from diaphragm 30 Matter 40 further increases safety when battery core work.

In the present embodiment, 5, Figure 15 is the structural schematic diagram of the first polarity piece of laminated cell in the present embodiment referring to Fig.1, The application scenarios that the first polarity piece in laminated cell is rectangular sheet and only extends an edge side are shown in Figure 15.The present embodiment In, 6, Figure 16 is the structural schematic diagram that the first polarity piece of battery core is wound in the present embodiment referring to Fig.1, shows winding in Figure 15 The first polarity piece is rectangular sheet and only extends the application scenarios of an edge side in battery core.

In the present embodiment, in order to further increase safety when battery core work, second in plus plate current-collecting body 10 extends Portion 102 is not coated on the basis of positive active material 40, can coat insulating coating on the second extension 102, wherein absolutely Edge coating can be ceramic coating, ceramics can for compound that the elements such as oxygen, carbon, nitrogen, boron, magnesium, aluminium, silicon and zinc are formed or The mixture of compound.

In the present embodiment, based on the same inventive concept, the coating of active material when extending the negative current collector 20 of battery core Situation has similar or identical characteristic with battery core shown in Figure 14, and overlaps will not be repeated.

Secondly, the coating situation of the active material of the first collector is illustrated, not in the first afflux in the embodiment of the present application The first active material is coated on second extension 102 of body, so that the active material on the first collector will not be because of by crowded It presses and touches the second adjacent collector, increase safety when battery core work.

Optionally, on the basis of above-mentioned Fig. 1 embodiment corresponding to Figure 16, the of battery core provided by the embodiments of the present application In two alternative embodiments, 7, Figure 17 is a kind of side view of laminated cell in the embodiment of the present application, the first polarity piece referring to Fig.1 It is contacted with 60 bottom of battery case.

By taking the battery core made of lamination process as an example, in the present embodiment, the first polarity piece extend and beyond it is adjacent every It on the basis of film 30, is further contacted with 60 bottom of battery case, by taking the first polarity piece is positive polarity piece as an example, specifically, can Plus plate current-collecting body 10 to be positive polarity piece is contacted with 60 bottom of battery case.Plus plate current-collecting body 10 is being subjected to extended one kind In design, it can only extend the length of very little, so that the edge side of plus plate current-collecting body 10 is just past adjacent diaphragm 30, without It is contacted with corresponding 60 bottom of battery case, the edge side and 60 bottom of battery case in the design, due to plus plate current-collecting body 10 Distance be less than the distance that diaphragm 30 arrives 60 bottom of battery case so that the heat generated inside the battery core not through diaphragm 30 into Row conduction, but since there may be other heat transfer mediums, such as electricity between battery case 60 for the edge side of plus plate current-collecting body 10 Solution matter or air, the thermal coefficient of the thermal conductivity ratio collector of these heat transfer mediums want small.In order to further in the present embodiment Increase inside battery core to the thermal coefficient of the heat-transfer path of battery case 60, by the edge side of plus plate current-collecting body 10 extend to The contact of 60 bottom of battery case, allows the heat generated inside battery core to be directly transmitted to battery case by plus plate current-collecting body 10 60 bottom of body.

It should be pointed out that being provided with backing board or insulation board 70, bottom in a kind of scene, between battery case and battery core Support class or insulation board and battery case constitute battery case component, play a part of protecting battery core, External Insulation jointly, such as scheme Shown in 18, Figure 18 is a kind of side view of laminated cell in the embodiment of the present application, in this scene, 60 bottom of battery case It can be understood as the outer surface of backing board or insulation board 70 in battery case component, specifically, the first polarity piece in the present embodiment With the appearance face contact of backing board or insulation board 70 in 60 bottom of battery case.

In the present embodiment, based on the same inventive concept, the active material when extending the negative current collector 20 of laminated cell Coating laminated cell shown in situation and Figure 17 or Figure 18 has similar or identical characteristic, and overlaps will not be repeated.

Secondly, in the present embodiment, by extending the first collector and making the first collector and 60 bottom of battery case Spacing be less than on the basis of the spacing of diaphragm 30 and 60 bottom of battery case, the first polarity piece and 60 bottom of battery case are connect Touching further increases inside battery core to the thermal coefficient of the heat-transfer path of battery case, obtains the production of power battery interior battery core Raw heat can be transmitted to outside batteries more quickly.

Optionally, on the basis of above-mentioned Figure 17 and Figure 18 corresponding second alternative embodiment, the embodiment of the present application is mentioned In the third alternative embodiment of the battery core of confession, one end of the first polarity piece is bending structure, the bending place of bending structure and electricity The contact of 60 bottom of pond shell.

In the present embodiment, the way of contact of the first collector Yu 60 bottom of battery case is described, referring to Fig.1 9, Tu19Wei A kind of side view of laminated cell in the embodiment of the present application, as shown, one end of the first collector 10 is L-type structure, L-type knot The outer surface of the bending part of structure is the contact surface of the first collector and 60 bottom of battery case, compared to one end of the first collector The scheme of point contact is carried out with 60 bottom of battery case, the contact area of L-type structure and 60 bottom of battery case in the present embodiment It is bigger, there is better heat transfer property.It, can be along the extension side end face of the first collector in actual battery core installation process Battery core is attached in battery case 60 by the direction of direction, applies an active force to battery core at this time, so that the first collector Extend side and 60 bottom point contact of battery case, continues to power, the extension side of the first collector can be made to deform, into And there is L-type bending structure, and the outer surface of the bending structure bending place and 60 bottom of battery case in one end of the first collector Contact.

It should be pointed out that a battery core may include one or more first collectors, correspondingly, one end is L-type knot First collector of structure is also possible to one or more, when the first collector that one end is L-type structure is multiple, each first The bending direction of the L-type structure of collector can be all identical, can also be different.It should be noted that term " bending direction " It can be understood as after deformation occurs in the extension side of the first collector, the end direction of the extension side of the first collector.In reality Battery core installation process in, due to during to battery core applied force, the bending of the extension side of the first collector is towards may Be it is uncontrollable, may a part bending towards from the bending of another part towards different.

In the present embodiment, in another kind design, referring to Figure 20, Figure 20 is a kind of laminated cell in the embodiment of the present application Side view, as shown, one end of the first polarity piece is inverted Y-shaped structure, the outer surface for the opening portion that inverted Y-shaped Liang Ge branch is formed For the contact surface of the first collector and 60 bottom of battery case, compared to the first collector one end and 60 bottom of battery case into The scheme of row point contact, inverted Y-shaped structure and the contact area of 60 bottom of battery case are bigger in the present embodiment, have and preferably pass Hot property.

In the present embodiment, it should be noted that one end of the first polarity piece is that bending structure can include but is not limited to The L-type structure and y-type structure stated, such as bending structure can be a part of annulus, be also possible to a part of elliptical ring, this Place is without limitation.

In the present embodiment, it should be noted that a battery core may include one or more first collector, when extending simultaneously When the first collector beyond neighboring separators 30 is multiple, the structure of the extended end of each first collector can be identical or not Together, such as in each first collector, a part is L-type structure, and a part is inverted Y-shaped structure or other bending structures, herein It does not limit.

Secondly, one end of the first polarity piece is bending structure, the bending place of bending structure and battery in the embodiment of the present application The contact of 60 bottom of shell, increases the contact surface of the first collector Yu 60 bottom of battery case, has better heat transfer property.

Optionally, on the basis of above-mentioned Figure 17 and Figure 18 corresponding second alternative embodiment, the embodiment of the present application is mentioned It is a kind of laminated battery in the embodiment of the present application referring to Figure 21 a and Figure 21 b, Figure 21 a in 4th alternative embodiment of the battery core of confession The side view of core, Figure 21 b are a kind of side view of laminated cell in the embodiment of the present application, and the end of the first polarity piece is embedded into electricity 60 bottom of pond shell or the end of the first polarity piece are bonded in 60 bottom of battery case or the end of the first polarity piece and are welded on 60 bottom of battery case.

In the present embodiment, the way of contact of the first collector Yu 60 bottom of battery case is further described, in the first pole The end of property piece is embedded into the design of 60 bottom of battery case, is referred to Figure 21 a, in the installation process of practical battery core, Can on 60 inner surface of battery case pregroove, by the way that the extension side of the first collector is direct in battery core installation process It is inserted into inside corresponding pregroove, to realize the contact of the first collector and battery case 60.At the end of the first polarity piece Portion is bonded in the design of 60 bottom of battery case, is referred to Figure 21 b, can be preparatory in the installation process of practical battery core In the extension side surface coated with adhesive of the first collector, or in 60 bottom interior surface coated with adhesive of battery case, in battery core Applying certain pressure in installation process keeps the extension side of the first collector Nian Jie with the realization of 60 bottom of battery case, thus realization the The contact of one collector and battery case 60.It is welded in the design of 60 bottom of battery case in the end of the first polarity piece, The extension side of the first collector is welded on 60 bottom interior surface of battery case in battery core installation process, to realize the first afflux The contact of body and battery case 60.

Secondly, the end of the first polarity piece is embedded into 60 bottom of battery case or the first polarity piece in the embodiment of the present application End be bonded in 60 bottom of battery case or the end of the first polarity piece and be welded on 60 bottom of battery case, the first collector It can be contacted in several ways with 60 bottom of battery case, increase the flexibility and alternative of scheme.

Optionally, on the basis of above-mentioned Fig. 1 to Figure 21 b corresponding embodiment, battery core provided by the embodiments of the present application It is a kind of side view of laminated cell in the embodiment of the present application referring to Figure 22, Figure 22 in 5th alternative embodiment, diaphragm 30 wraps Include the first diaphragm 301 and the first diaphragm 302；Second collector is provided between first diaphragm 301 and the first diaphragm 302, The engagement of the end of first diaphragm 301 and the first diaphragm 302.

In the present embodiment, in order to improve the heat-transfer path from battery core to battery case, by plus plate current-collecting body 10 or cathode collection Fluid 20 extends and exceeds diaphragm 30, due to only prolonging one of collector of plus plate current-collecting body 10 and negative current collector 20 It is long, by it is extended be plus plate current-collecting body 10 for, negative current collector 20 does not extend at this time, therefore adjacent with negative current collector 20 Diaphragm 30 (the first diaphragm 301 and the first diaphragm 302) edge side exceed the negative current collector 20.But in the mistake of packaging electric core Cheng Zhong, the active material on extended plus plate current-collecting body 10 are possible to touch adjacent negative current collector because of being squeezed 20 or negative electrode active material 50, and then there is the safety problem of short circuit, therefore in the present embodiment, it will be adjacent with negative current collector 20 The first diaphragm 301 and the first diaphragm 302 end engagement, by the obstruction of diaphragm 30 so that negative current collector 20 completely with prolong Long plus plate current-collecting body 10 is isolated, and further improves the safety in battery core installation process.

It should be noted that in the scene that plus plate current-collecting body 10, negative current collector 20 and diaphragm 30 are rectangular sheet, anode Collector 10 can be by C1 or plus plate current-collecting body on the left of plus plate current-collecting body top side A1, plus plate current-collecting body bottom side B1, plus plate current-collecting body At least two sides of right side D1 are extended, at this point, not being on the negative current collector 20 adjacent with extended plus plate current-collecting body 10 Each edge side has the safety problem being in contact with plus plate current-collecting body 10, and only in the extension side phase of plus plate current-collecting body 10 Corresponding edge side just has the safety problem being in contact with plus plate current-collecting body 10.For example, plus plate current-collecting body 10 is by plus plate current-collecting body Top side A1 and plus plate current-collecting body bottom side B1 are extended, at this point, on negative current collector 20 only have 20 top side of negative current collector and 20 bottom side of negative current collector has the safety problem being in contact with plus plate current-collecting body 10, therefore, need to only push up negative current collector 20 Adjacent the first diaphragm 301 in side and 20 bottom side of negative current collector and the engagement of the first diaphragm 302, specifically, can be by first The diaphragm top side A2 of the diaphragm top side A2 of diaphragm 301 and the first diaphragm 302 engagement, and by the diaphragm bottom side B2 of the first diaphragm 301 It is engaged with the diaphragm bottom side B2 of the first diaphragm 302.In the present embodiment, in plus plate current-collecting body 10, negative current collector 20 and diaphragm 30 In the scene of rectangular sheet, not to be by four sides of first diaphragm 301 and first diaphragm 302 adjacent with negative current collector 20 Edge side all engages, and only engages 30 edge side of diaphragm corresponding with the extension side of plus plate current-collecting body 10, is improving electricity On the basis of the safety of core installation, material cost is saved.

Secondly, diaphragm 30 includes the first diaphragm 301 and the first diaphragm 302 in the embodiment of the present application；First diaphragm, 301 He Be provided with second collector between first diaphragm 302, the end engagement of the first diaphragm 301 and the first diaphragm 302, will with it is negative The end of the first adjacent diaphragm 301 of pole collector 20 and the first diaphragm 302 engagement, by the obstruction of diaphragm 30 so that cathode collection Fluid 20 is isolated with extended plus plate current-collecting body 10 completely, further improves the safety in battery core installation process.

Based on above-mentioned each embodiment, present invention also provides a kind of power battery, which has included that Fig. 1 extremely schemes Any one battery core and battery case 60 in 22, wherein battery case 60 is internally provided with battery core.It is pointed out that battery Shell 60 can have shape corresponding with the shape of battery core.However, it is not necessary to keep the shape and size of battery case 60 complete Match the shape and size of battery core.

Based on above-mentioned each embodiment, present invention also provides a kind of power battery pack, the power battery pack contain to The power battery of few two above-described embodiments description.

Based on above-mentioned each embodiment, present invention also provides a kind of power device, which contains at least one The power battery of a above-described embodiment description, specifically, this kind of power device can be mobile phone, portable computer, intelligence It can phone, Intelligent flat, net book, light electric vehicle, electric vehicle, hybrid electric vehicle, plug-in hybrid electricity Motor-car is also possible to electrical storage device and other kinds of electrical equipment, is not construed as limiting herein.

Embodiment shown in Fig. 1 to Figure 22 is the detailed description carried out to the specific structure of battery core, below in conjunction with Figure 23 institute The production method based on the power battery is described in detail in the embodiment shown, please refers to Figure 23, and Figure 23 is the application implementation One embodiment schematic diagram of the production method of power battery in example, as shown, the production method of power battery includes:

101, the first polarity piece, diaphragm 30 and the second polarity piece are stacked gradually into placement, to form battery core, wherein at least The side of one the first polarity piece exceeds diaphragm 30, and the first polarity piece includes the first collector；

In the present embodiment, in the manufacturing process of battery core, it is necessary first to by the first polarity piece cut, diaphragm 30 and Two polarity pieces stack gradually placement, and the length of the first polarity piece is controlled when cutting, so that at least one first polarity piece can Exceed the edge side of neighboring separators 30 with an edge side in stacking, specifically, can be the first collection of the first polarity piece One edge side of fluid exceeds the edge side of neighboring separators 30.It should be noted that battery core includes multiple first polarity pieces, this Battery core in embodiment can be an edge side of the first polarity piece of at least one of multiple first polarity pieces in stacking Edge side beyond neighboring separators 30.

In the present embodiment, the polarity of the first polarity piece and the second polarity piece is different, it should be noted that in lamination process In, any one in the first polarity piece, diaphragm 30 and the second polarity piece can be arranged in the outermost of laminated body.

102, battery core is loaded to battery case 60 along target direction, so that at least one first collector and battery The spacing of 60 bottom of shell be less than diaphragm 30 and 60 bottom of battery case spacing, target direction be the first polarity on piece beyond every The direction of 30 side of film.

It in the present embodiment, after the production of complete battery core, needs for battery core to be assembled in battery case, battery case can be with It is the shell of a side opening.Since an edge side of the first collector of at least one the first polarity piece in battery core is beyond adjacent The edge side of diaphragm 30, to guarantee that the spacing of at least one first collector and 60 bottom of battery case is less than diaphragm 30 and battery The spacing of 60 bottom of shell needs to load battery core to battery case 60 along target direction, which is the first polarity On piece exceeds the direction of 30 side of diaphragm.

It, can be by the top of the tab of battery core and battery case after battery core is assembled in battery case in the present embodiment Lid is welded, and is sealed to power battery, it is to be understood that in practical applications, it is also necessary to dynamic to what is assembled Power battery carries out the processing such as fluid injection, chemical conversion, pumping, welding liquid injection hole, cleaning.

In the embodiment of the present application, a kind of production method of power battery is provided, by the first polarity piece, diaphragm 30 and second Polarity piece stacks gradually placement, to form battery core, wherein the side of at least one the first polarity piece exceeds diaphragm 30, the first pole Property piece include the first collector, battery core is loaded to battery case 60 along target direction, so that at least one first afflux The spacing of body and 60 bottom of battery case is less than the spacing of diaphragm 30 and 60 bottom of battery case, and target direction is the first polarity piece The upper direction beyond 30 side of diaphragm.The power battery made by the above method, the first collector and battery in battery core The spacing of 60 bottom of shell is set smaller than the spacing of diaphragm 30 Yu 60 bottom of battery case, so that a part of heat that battery core generates Battery case 60 can be transmitted to by collector, since the thermal coefficient of collector is far longer than diaphragm 30, power electric A part of heat that battery core generates inside pond can be rapidly transferred to battery case 60 by collector, so that power battery interior The heat that battery core generates can be rapidly transferred to outside batteries.

Optionally, on the basis of above-mentioned Figure 23 corresponding embodiment, the system of power battery provided by the embodiments of the present application Make in first alternative embodiment of method, the first polarity piece, diaphragm 30 and the second polarity piece stacked gradually into placement, comprising:

First polarity piece, diaphragm 30 and the second polarity piece are successively placed with Flat stacked.

It in the present embodiment, describes under the application scenarios of lamination, the production method of battery core.

Optionally, the first polarity piece, diaphragm 30 and the second polarity piece are stacked gradually into placement, comprising:

First polarity piece, diaphragm 30 are stacked gradually with the second polarity piece and place and be wound, to form battery core, In, the first polarity piece side vertical with coiling direction exceeds diaphragm 30.

It in the present embodiment, describes under the application scenarios of winding, the production method of battery core.

Optionally, the first polarity piece, diaphragm 30 and the second polarity piece are stacked gradually into placement, to form battery core, wherein extremely The side of a few first polarity piece exceeds diaphragm 30, comprising:

First polarity piece is punched to single sheet the first polarity piece；

Second polarity piece is stacked gradually with diaphragm 30 and places and is wound, single sheet the first polarity piece is arranged in volume Adjacent windings interlayer after forms battery core, wherein at least one single sheet the first polarity piece is vertical with coiling direction in Side exceeds diaphragm 30.

It in the present embodiment, describes under the application scenarios of winding, the production method of battery core, and is made up of lamination process Battery core polarity piece and diaphragm 30 are successively placed with Flat stacked unlike, firstly, the diaphragm 30, just that lamination process uses Pole collector 10 and negative current collector 20 can be single sheet rectangular sheet, and diaphragm 30, the plus plate current-collecting body that winding process uses 10 and negative current collector 20 can be the rectangle lengthy motion picture for not being punched into single sheet rectangular sheet, in addition, by winding process made of Battery core is wound after the first polarity piece, diaphragm 30 are stacked gradually placement with the second polarity piece, therefore, on the first collector The position that can carry out extending and being more than neighboring separators 30 can only be along the vertical direction wound.

Second polarity piece is punched to single sheet the second polarity piece；

First polarity piece is stacked gradually with diaphragm 30 and places and is wound, single sheet the second polarity piece is arranged in volume Adjacent windings interlayer after forms battery core in, wherein at least one the first polarity piece side vertical with coiling direction is super Diaphragm 30 out.

In the present embodiment, describe in a kind of production side of battery core of the application scenarios of manufactured battery core by winding process Formula, and unlike the battery core made of lamination process, pass through lamination and the pole for winding battery core made of the technique combined Property on piece can carry out extend and be more than neighboring separators 30 position can only be along winding vertical direction edge side.

First polarity piece is punched to single sheet the first polarity piece；

Second polarity piece is punched to single sheet the second polarity piece；

Diaphragm 30 is repeatedly folded, single sheet the first polarity piece and single sheet the second polarity piece are arranged alternately and are being rolled over In the interval of neighboring separators 30 of poststack, battery core is formed, wherein at least one single sheet the first polarity piece is vertical with folding direction Side exceeds diaphragm 30.

In the present embodiment, describe in a kind of production side of battery core of the application scenarios of manufactured battery core by winding process Formula, and by winding process unlike manufactured battery core, in the first collector, diaphragm 30 and the second collector in the present embodiment For under the scene of rectangular sheet, the first collector is single sheet rectangular sheet, can carry out extending and more than adjacent on the first collector Three edge sides for being located along neighboring separators 30 and being spaced the direction of open on three sides of diaphragm 30, change a kind of describing mode, this reality Apply other three edge sides on the first collector in example other than being spaced the edge side in closing direction in neighboring separators 30 It can extend and beyond adjacent diaphragm 30.

Optionally, on the basis of above-mentioned Figure 23 corresponding embodiment, the system of power battery provided by the embodiments of the present application Make in second alternative embodiment of method, loads battery core to battery case 60 along target direction, so that at least one The spacing of first collector and 60 bottom of battery case is less than the spacing of diaphragm 30 and 60 bottom of battery case, comprising:

Battery core is loaded to battery case 60 along target direction, so that at least one first collector and battery case The contact of 60 bottoms.

It, can be along the extension side end face direction of the first collector in actual battery core installation process in the present embodiment Direction (target direction) battery core is filled into battery case 60, at this time to battery core apply an active force so that first collection The extension side of fluid and 60 bottom point contact of battery case.Optionally, if continuing to power, the first collector can be made Extend side to deform, and then L-type bending structure, and the outer surface of the bending structure bending place occurs in one end of the first collector It is contacted with 60 bottom of battery case.Optionally, one end of the first collector can also be inverted Y-shaped structure, and inverted Y-shaped Liang Ge branch is formed Opening portion outer surface be the first collector and 60 bottom of battery case contact surface.

It should be pointed out that backing board or insulation board 70 are provided between battery case 60 and battery core in a kind of scene, Collet class or insulation board and battery case constitute battery case component, play a part of protecting battery core, External Insulation jointly, In this scene, 60 bottom of battery case can be understood as the outer surface of backing board or insulation board 70 in battery case component, this Specifically, the first polarity piece and the appearance face contact of backing board or insulation board 70 in 60 bottom of battery case in embodiment.

In the present embodiment, battery core is loaded to battery case 60 along target direction, so that at least one first afflux Body is contacted with 60 bottom of battery case, by extending the first collector and making the first collector and 60 bottom of battery case Spacing is less than on the basis of the spacing of diaphragm 30 and 60 bottom of battery case, and the first polarity piece and 60 bottom of battery case are connect Touching further increases inside battery core to the thermal coefficient of the heat-transfer path of battery case, obtains the production of power battery interior battery core Raw heat can be transmitted to outside batteries more quickly.

Optionally, battery core is loaded to battery case 60 along target direction so that at least one first collector with The contact of 60 bottom of battery case, comprising:

Battery core is loaded to battery case 60 along target direction, so that at least one first collector is embedded into battery 60 bottom of shell；

Or, battery core is loaded to battery case 60 along target direction, so that at least one first collector is bonded in 60 bottom of battery case；

Or, battery core is loaded to battery case 60 along target direction, so that at least one first collector is welded on 60 bottom of battery case.

In the present embodiment, the way of contact of the first collector Yu 60 bottom of battery case is further described, in the first pole The end of property piece is embedded into the design of 60 bottom of battery case, can be in battery case in the installation process of practical battery core Pregroove on 60 inner surfaces, it is corresponding default by the way that the extension side of the first collector to be inserted directly into battery core installation process Trench interiors, to realize the contact of the first collector and battery case 60.Battery case is bonded in the end of the first polarity piece In the design of 60 bottom of body, in the installation process of practical battery core, it can be coated in advance in the extension side surface of the first collector Binder, or in 60 bottom interior surface coated with adhesive of battery case, applying certain pressure in battery core installation process makes first The extension side of collector is Nian Jie with the realization of 60 bottom of battery case, to realize the contact of the first collector and battery case 60. It is welded in the design of 60 bottom of battery case in the end of the first polarity piece, by the first collector in battery core installation process Extend side and be welded on 60 bottom interior surface of battery case, to realize the contact of the first collector and battery case 60.

Secondly, battery core can be loaded to battery case 60 along target direction, in the embodiment of the present application so that at least One the first collector is embedded into 60 bottom of battery case；Or, load battery core to battery case 60 along target direction, so that It obtains at least one first collector and is bonded in 60 bottom of battery case；Or, battery core is loaded to battery case 60 along target direction It is interior, so that at least one first collector is welded on 60 bottom of battery case, increase the flexibility and alternative of scheme.

It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description, The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.

In several embodiments provided herein, it should be understood that disclosed system, device and method can be with It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the division of unit, Only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components can be with In conjunction with or be desirably integrated into another system, or some features can be ignored or not executed.Another point, it is shown or discussed Mutual coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING of device or unit or Communication connection can be electrical property, mechanical or other forms.

The above, above embodiments are only to illustrate the technical solution of the application, rather than its limitations；Although referring to before Embodiment is stated the application is described in detail, those skilled in the art should understand that: it still can be to preceding Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these It modifies or replaces, the spirit and scope of each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution.

Claims

1. a kind of battery core, it is characterised in that: including the first polarity piece, the second polarity piece and diaphragm, wherein first polarity The diaphragm, the polarity phase of the first polarity piece and the second polarity piece are provided between piece and the second polarity piece It is different；

The first polarity piece includes the first collector, the spacing of first collector and battery housing base be less than it is described every The spacing of film and the battery housing base.

2. battery core according to claim 1, which is characterized in that first collector includes the first extension interconnected And second extension；

First extension is coated with the first active material, and second extension is from the first active material internal stretch And exceeding the diaphragm, the spacing of second extension and battery housing base is less than the diaphragm and the battery case bottom The spacing in portion.

3. battery core according to claim 2, which is characterized in that be coated with insulating coating on second extension.

4. battery core according to any one of claims 1 to 3, which is characterized in that first collector and the battery case Bottom contact.

5. battery core according to claim 4, which is characterized in that one end of first collector is bending structure, described The bending place of bending structure is contacted with the battery housing base.

6. battery core according to claim 4, which is characterized in that the end of first collector is embedded into the battery case Body bottom or the end of first collector are bonded in the end weldering of the battery housing base or first collector It connects in the battery housing base.

7. battery core according to any one of claims 1 to 6, which is characterized in that the diaphragm include the first diaphragm and second every Film；

Second collector, first diaphragm and described second are provided between first diaphragm and second diaphragm The end of diaphragm engages.

8. battery core according to any one of claims 1 to 7, which is characterized in that the first polarity piece is positive polarity piece, described Second polarity piece is negative polarity piece；

Or, the first polarity piece is negative polarity piece, the second polarity piece is positive polarity piece.

9. a kind of power battery, which is characterized in that the power battery include battery core as described in any of the claims 1 to 8 and Battery case；

The battery case is internally provided with the battery core.

10. a kind of power battery pack, which is characterized in that including at least two power batteries as claimed in claim 9.

11. a kind of power device, which is characterized in that including at least one power battery according to claim 9.

12. a kind of production method of power battery characterized by comprising

First polarity piece, diaphragm and the second polarity piece are stacked gradually into placement, to form battery core, wherein at least one described The side of one polarity piece exceeds the diaphragm, and the first polarity piece includes the first collector；

The battery core is loaded to the battery case along target direction, so that at least one described first collector and institute The spacing for stating battery housing base is less than the spacing of the diaphragm and the battery housing base, and the target direction is described the One polarity on piece exceeds the direction of the diaphragm side.

13. the production method of power battery according to claim 12, which is characterized in that it is described by the first polarity piece, every Film and the second polarity piece stack gradually placement, comprising:

First polarity piece, diaphragm and the second polarity piece are successively placed with Flat stacked.

14. the production method of power battery according to claim 12, which is characterized in that it is described by the first polarity piece, every Film and the second polarity piece stack gradually placement, to form battery core, wherein the side of at least one the first polarity piece exceeds institute State diaphragm, comprising:

First polarity piece, diaphragm are stacked gradually with the second polarity piece and place and be wound, to form battery core, wherein at least One the first polarity piece side vertical with coiling direction exceeds the diaphragm.

15. the production method of power battery according to claim 12, which is characterized in that it is described by the first polarity piece, every Film and the second polarity piece stack gradually placement, to form battery core, wherein the side of at least one the first polarity piece exceeds institute State diaphragm, comprising:

First polarity piece is punched to single sheet the first polarity piece；

Second polarity piece is stacked gradually with diaphragm and places and is wound, the first polarity of single sheet piece is arranged in winding Adjacent windings interlayer afterwards forms battery core, wherein at least one described the first polarity of single sheet piece is vertical with coiling direction in Side exceed the diaphragm；

Or, the second polarity piece is punched to single sheet the second polarity piece；

First polarity piece is stacked gradually with diaphragm and places and is wound, the second polarity of single sheet piece is arranged in winding Adjacent windings interlayer afterwards forms battery core, wherein at least one the first polarity piece side vertical with coiling direction in Beyond the diaphragm；

Or, the first polarity piece is punched to single sheet the first polarity piece；

Second polarity piece is punched to single sheet the second polarity piece；

Diaphragm is repeatedly folded, single sheet the first polarity piece and the single sheet the second polarity piece are arranged alternately In folded neighboring separators interval, battery core is formed, wherein at least one described single sheet the first polarity piece and folding direction hang down Straight side exceeds the diaphragm.

16. the production method of 2 to 15 any power batteries according to claim 1, which is characterized in that described along target side It loads to by the battery core to the battery case, so that at least one described first collector and the battery case bottom The spacing in portion is less than the spacing of the diaphragm and the battery housing base, comprising:

The battery core is loaded to the battery case along the target direction, so that at least one described first collector It is contacted with the battery housing base.

17. the production method of power battery according to claim 16, which is characterized in that it is described will be described along target direction Battery core is loaded to the battery case, so that at least one described first collector is contacted with the battery housing base, Include:

The battery core is loaded to the battery case along target direction, so that at least one described first collector insertion To the battery housing base；

Or, the battery core is loaded to the battery case along target direction, so that at least one described first collector It is bonded in the battery housing base；

Or, the battery core is loaded to the battery case along target direction, so that at least one described first collector It is welded on the battery housing base.